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Byju's Answer
Standard IX
Mathematics
Natural Numbers
State which o...
Question
State which of the following are surds. Justify.
(i)
7
3
(ii)
0
.
16
4
(iii)
8
3
(iv)
-
5
(v)
1
15
(vi)
0
.
333
(vii)
576
(viii)
5
4
(ix)
22
7
(x)
2
+
9
3
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Solution
a
n
is
a
surd
if
'
n
'
is
a
natural
number
n
≠
1
and
'
a
'
is
a
positive
rational
number
.
(i)
7
3
:
H
ere
,
3
is
a
natural
number
and
7
is
a
positive
rational
number
.
Hence
,
it
is
a
surd
.
(ii)
0
.
16
4
:
H
ere
,
4
is
a
natural
number
and
0
.
16
is
a
positive
rational
number
.
Hence
,
it
is
a
surd
.
(iii)
8
3
=
8
6
8
6
:
H
ere
,
6
is
a
natural
number
and
8
is
a
positive
rational
number
.
Hence
,
it
is
a
surd
.
(iv)
-
5
:
H
ere
,
-
5
is
not
a
positive
rational
number
.
Hence
,
it
is
not
a
surd
.
(v)
1
15
=
1
15
H
ere
,
2
is
a
natural
number
and
1
15
is
a
positive
rational
number
.
Hence
,
it
is
a
surd
.
(vi)
0
.
333
:
H
ere
,
2
is
a
natural
number
and
0
.
333
is
a
positive
rational
number
.
Hence
,
it
is
a
surd
.
(vii)
576
=
24
is
not
an
irrational
number
.
Hence
,
it
is
not
a
surd
.
(viii)
5
4
:
H
ere
,
2
is
a
natural
number
and
5
4
is
a
positive
rational
number
.
Hence
,
it
is
a
surd
.
(ix)
22
7
:
H
ere
,
2
is
a
natural
number
and
22
7
is
a
positive
rational
number
.
Hence
,
it
is
a
surd
.
(x)
2
+
9
3
=
2
+
3
3
=
5
3
5
3
:
H
ere
3
is
a
natural
number
and
5
is
a
positive
rational
number
.
Hence
,
it
is
a
surd
.
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